Top-of-the-line road cassette with the bulk of the cogs machined in one piece of tool-grade steel for low weight, no cog flex and high durability. Largest cog is aluminum.

• Stealth Rings between the cogs minimize chain noise
• Hollow steel dome makes for the stiffest gear cluster ever at the lightest weight
• 11 speed cassettes with 11 tooth cogs have the smallest cog located behind the cassette in the packaging